Androids 4 and 5

Androids 4 and 5 were to Androids Created by Doctor Gero that were never activated until a human came across Gero's lab.

Android 4

Android 4 is a ruthless killer with no remorse he is the dumber of the group usually acting on instinct alone and never stopping despite the tasks.

Android 5

Android 5 is the smarter one and designed after Frieza's race he is much stronger then Android 4 due to him thinking about what he should do instead of randomly attacking.